ruby-on-rails - 如何在 Rails 查询中找到 nil 的对立面

Question

像这样愉快地使用 Mongoid 和 ActiveRecord:

Task.where(project_id: params[:project_id], archived_at: nil)
# find me the tasks for project_id that haven't been archived

但是说相反话的直截了当的方式是什么？

# find me the tasks for project_id that have been archived
# i.e. where archived_at is not nil

第一行代码的逆算不出来或求反。我认为它应该很简单:)

Answer 1

我想你想用这个:

:archived_at.ne => nil 

看这里:MongoId-Matchers-NE